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Influence of the Velocity Near the Spark Plug on Early Flame Development

Författare

  • Bengt Johansson

Summary, in English

The objective of this paper is to investigate how the

velocity and turbulence within different locations close to

the spark plug influence the combustion at individual

cycles in a SI-engine.

2-D cycle-resolved laser doppler velocimetry

(LDV) measurements have been done both inside the spark

gap and around the spark tip to extract velocity

information. The pressure in the cylinder was measured

with a piezo-electric transducer connected to an A/D-card

in a standard PC.

The velocity information was filtered to get "mean

velocity" and "turbulence". The pressure signal was used

in a one-zone heatrelease model to get different levels of

mass fraction burned etc.

The results show a significant influence of both the

"mean velocity" and the "turbulence" on the early part of

the combustion when the velocity was measured close to

the spark plug tip. The influence was less significant when

the velocity was measured at some distance from the

electrodes for both a pancake and a high squish

combustion chamber. The correlation between the velocity

close to the spark plug and the early flame development

showed no dependence on the air-fuel ratio and a modest

dependence on ignition timing.

Publiceringsår

1993

Språk

Engelska

Publikation/Tidskrift/Serie

SAE Technical Paper Series

Dokumenttyp

Konferensbidrag

Förlag

Society of Automotive Engineers

Ämne

  • Other Mechanical Engineering

Nyckelord

  • cycle-cycle variation
  • combustion engine
  • LDV
  • velocity measurement

Conference name

SAE International Congress and Exposition

Conference date

0001-01-02

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0148-7191